/*
 * Copyright (C) 2021 Huawei Device Co., Ltd.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package io.sentry.config;

import io.sentry.ILogger;
import io.sentry.SentryLevel;

import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.Properties;

import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;

/**
 * Loads {@link Properties} from file system location.
 *
 * @since 2021-06-02
 */
final class FilesystemPropertiesLoader implements PropertiesLoader {
    private final @NotNull String filePath;
    private final @NotNull ILogger logger;

    public FilesystemPropertiesLoader(@NotNull String filePath, @NotNull ILogger logger) {
        this.filePath = filePath;
        this.logger = logger;
    }

    @Override
    public @Nullable Properties load() {
        try {
            final File file = new File(filePath);
            if (file.isFile() && file.canRead()) {
                try (InputStream is = new BufferedInputStream(new FileInputStream(file))) {
                    final Properties properties = new Properties();
                    properties.load(is);
                    return properties;
                }
            }
        } catch (IOException e) {
            logger.log(
                SentryLevel.ERROR, e, "Failed to load Sentry configuration from file: %s", filePath);
            return null;
        }
        return null;
    }
}
